Hi Marius!
What do you mean by ‘battery’? a usb powerbank ?
I used a USB power bank in many occasions without problems.
Please keep in mind that some USB stuff (power supplies, pc ports, batteries etc… ) has a very wide ‘idea’ of a 5V voltage 🙂
Sometime you get as low as 4.7V and sometime you have a very good 5.1V…
In the first case it is possible that the S&H (and other circuits) behave out of specs…
Can you measure the voltage comeing from your battery?